If a pizza delivery brings your pizza and it costs 15.44 and you give him a 20 and tell him to keep the change, how does he keep his tip portion separate from the money that was for the bill.....how does he get is 4.54?
      Answer1:i am not sure but i really want a pizza now, damn you!
      Answer2:They just put back whatever they needed to collect
      Answer3:Most places, when he goes back he pays the register 15.44. ANything leftover is his.